He and [Toni] Morrison often bicker about commas — he loves them, she uses them sparingly. “I am right and he is wrong,” she said in an email. “He uses commas grammatically. I deploy them musically.” He usually wins, she noted.Here's Gottlieb's memoir: "Avid Reader: A Life."
Mr. Gottlieb and Robert Caro, the author of “The Power Broker,” a Pulitzer Prize-winning biography of Robert Moses, and an ongoing, multivolume biography of Lyndon B. Johnson, fight about semicolons, which Mr. Caro finds indispensable, and Mr. Gottlieb uses only as a last resort. Often, their shouting matches erupted into the hallways of Knopf’s offices, when one of them slammed the door and stormed out.
“He would always say, ‘Bob Caro has a terrible temper.’ The truth is, we both have a terrible temper,” said Mr. Caro.... “He’s willing to spend an entire morning fighting over whether something should be a period or a semicolon.”
September 24, 2016
From a NYT article about the longtime Knopf editor Robert Gottlieb: